Often, this is because theyre creatures
Card Set(s) -ONE PIECE HEROINES EDITION- [EB-03] CARD VIEW EB03-053 | SP CARD | CHARACTER Nami Attribute Special Block icon 4 Effect [On Play] Give up to 1 rested DON
Aboleth Spawn Abomination Abomination of Gudul Abomination of Llanowar Abyssal Gatekeeper Abyssal Gorestalker Abyssal Horror Abyssal Nocturnus Advanced Stitchwing Ahriman Ancient Cellarspawn Appendage Amalgam Arcbound Fiend Armaggon, Future Shark Arvinox, the Mind Flail Atraxa, Praetors' Voice Awoken Horror Balefire Liege Bedlam Reveler Blistergrub Bloodcurdler Boneshard Slasher Brainstealer Dragon Bruna, the Fading Light Cabal Therapist Canker Abomination Captain N'ghathrod Carnival Carnivore Carrion Locust Cateran Brute Cateran Enforcer Cateran Overlord Cateran Slaver Chained Throatseeker Chasm Skulker Childhood Horror Chittering Host Chupacabra Echo Clammy Prowler Cleaver Skaab Comet Crawler Conduit of Storms Consuming Aberration Core Prowler Corrupted Harvester Cosmic Horror Crawling Chorus Creakwood Liege Creeping Inn Cruel Witness Crypt Lurker Cryptborn Horror Culvert Ambusher Cursed Monstrosity Dark Hatchling Dauthi Horror Deathbonnet Hulk Deathbringer Liege Defiler of Flesh Delraich Demolisher Spawn Despoiler of Souls Devouring Strossus Devouring Sugarmaw Dinrova Horror Docent of Perfection Doom Weaver Douser of Lights Dread Osseosaur Dread Reaper Dread Slag Dread Slaver
The first deck was a game-ending combo strategy built around an artifact called Aetherworks Marvel, which allowed players to cheat in high cost creatures without paying for their mana value
And yes, I am fully aware that there are workarounds to try to make the economy cheaper, with the biggest being playing a bunch of limited and rare-drafting aggressively, but just because there is a weird hack to make a very unfriendly system slightly more friendly doesn't mean the system is good
